Knotter for coiled springs



April 1-, 1924. 1,488,491

(5- GERBERDING KN O'ITER FOR COILED SPRINGS Filed Oct. 2 1, 1.922 2 Sheets-Sheet gwm ntom Geo/7e Gerherdingz April 1 1924.

G. GERBERDING KNOTTER FOR GOILED SPRINGS Filed Oct. 21, 1.922 2 Sheets-Sheet 2 aw 91M? Patented Apr. 1, 1924.

UNITED STATES PATENT OFFICE.

GEORGE GERBERDING, 0F DETROIT, MICHIGAN, ASSIGNOR TO L. A. YOUNG INDUS- TRIES, INC., OF DETROIT, MICHIGAN.

KNOTTER FOR CO'ILED SPRINGS.

Application filed. October 21, 1922. Serial No. 595,938.

To all whom it may concern.

, Be it known that I, GEORGE GERB RDING, a citizen of the United States, residing at Detroit, county of Wayne, State of Michigan, have invented certain new and useful Improvements in Knot-ters for Coiled Springs, of which the following is a specification.

This invention relates to improvements in knotters for coiled springs.

In the manufacture of coiled springs such as the hehcally coiled springs employed in mattresses, spring seats and the like, the ends of the springs are tied or knot-ted to the adjacent coil by wrapping around the same. This operation is commonly performed by a machine known as a knotter and my improvements relate particularly to the knotter block of such machines. As this knotter block has been heretofore formed the knotted or tied springs when resting on their end coils are unstable and usually incline. It is the main object of this invention to provide a machine which produces springs in which, this defect is not present, the springs when resting on their bottom coils being upright and quite stable.

Further objects, and objects relating to structural details, will definitely appear from the detailed description to follow.

I accomplish the objects of my invention by the devices and means described in the following specification. The invention is clearly defined and pointed out in the claims.

A structure which is a preferred embodiment of my invention is clearly illustrated in the accompanying drawing, forming a part of this application, in which:

F ig, I is a side perspective view of a spring knotting machine. embodying the features of my invention, the pedestal being partially broken away.

Fig.'II is a fragmentary front perspective vlew.

Fig. III is a fragmentary front perspective view with a spring in knotting position.

Fig. IV is a fragmentary plan View showing the position of the spring on the knotter block with the knotter gearin retracted position.

Fig. IV is a fragmentary plan view similar to that of Fig. IV with the knotter gear in its forward or knotting position.

Fig. V is an enlarged detail section on a my imjters refer to similar parts throughout the several views and the sectional views are taken looking in the direction of the little. arrows at the ends of the section lines.

Referring to the drawing, 1 represents the upright of the machine having a worktable 2 thereon. The-knotter gear 8 which is of a well-known type and also its driving gear is mounted upon the swinging arm 4 which is oscillated by means of the cam 5. The knotter gear is intermittently driven from the segmeneal gear 6. The details, however, of the knotter gear and its driving c0nnections form no part of this invention and are, therefore, not further described herein.

My improved knotter or die block 7 is mounted. upon the table 2 so that the jaw 8 coacts therewith to clamp the bottom coil 9 and the adjacent coil 10 of the spring While the knotting'o-peration is performed thereon,see Figs. IV, IV and V, the knot or tie formed by the machine being show 11 at 11, see Fig. III, the spring illustrated being a double helically coiled spring, both ends of which are knotted or tied. The block 7 is shouldered at 12, the end of the shoulder being curved as shown in the drawing so that the end of the springis formed around the same as shown in Fig. IV

The face 13 ofthe knotter-block at the base of the shoulder is inclined outwardly or away from the knotter gear, while the face 14 of the shoulder or raised portion is inclined toward the knotter gear and is provided with an inwardlytapered groove 15 which receives the coil 10. The groove,

however, is of such depth that the coil projects above the same as shown in Fig. V to be engaged by the shouldered'clamping jaw 8, which is mounted on the arm 4 and actuated by the forward movement of the arm to clamp the spring. This forward move mentof the arm bends the end 16 of the bottom coil around the shoulder of the die block as shown in Fig. IV so that on the rotation of the nozzle gear it is engaged by the knotting finger 17 and twisted or wrapped around the coil 10 supported by the shouldered when secured or arranged in a cushion or mattress or the like it is not likely to tilt over when subjected to'pressure.

Having thus described my invention What I claim as new and desire to secure by Letters Patent is 1. In a spring tying machine, the combination with a coiler gear, of a shouldered knotter block operatively associated with said gear, the end of the shoulder being curved to support the end coil of a spring disposed atthe'ba'se thereof, the face of the block at the base of the shoulder being inclined outwardly relative to the coiler gear, the face of the shoulder being inclined inwardly toward the coiler gear and having an inwardly tapering groove therein adapted to receive the coil of a spring adjacent the end 001], and a shouldered clamping aw clamping the end 0011 at the base of the shoulder and coil disposed-in said groove,

all eoacting as specified. 7

2. In a spring tying machine, the combination with a- ,coiler gear, of a shouldered knotter block operatively associated with said gear,v the end of the shoulder being adapted to support the end coil of a spring In Witness whereof I have hereunto set my hand and seal.

GEORGE GERBERDING. [1,. s.] 

